scope

来源： https://stackoverflow.com/questions/13784998/js-nested-functions-gain-a-copy-of-the-outer-functions-parameters

来源： https://stackoverflow.com/questions/14692071/sharing-scope-in-python-between-called-and-calling-functions

来源： https://stackoverflow.com/questions/14692071/sharing-scope-in-python-between-called-and-calling-functions

来源： https://stackoverflow.com/questions/8455504/inner-nested-scope-in-methods

来源： https://stackoverflow.com/questions/63337235/what-are-the-benefits-and-drawbacks-of-variable-hoisting-in-programming-language

来源： https://stackoverflow.com/questions/63459791/why-do-these-css-variables-not-work-when-passed-into-calc

来源： https://stackoverflow.com/questions/51564669/changing-global-variables-within-a-function-in-python

问题 is there a feautre similar to C macros which lets you reuse code in an inline manner, without creating a seperate scope for that piece of code? for example: a=3 def foo(): a=4 foo() print a will print 3, however i want it to print 4. i am aware of solutions involving objects like classes or a global dict, however i'm looking for a more primitive solution (like a function decorator for example) that would simply let me make changes inside the scope of the caller instead. thank you very much

问题 C++17 has selection statements with initializer status_code foo() { if (status_code c = bar(); c != SUCCESS) { return c; } // ... } I'd like to write a while -loop and a variable with a scope limited to the loop and initialized only once before the first iteration. // fake example, doesn't compile, is doable in many ways while (bool keep_trying = foo(); keep_trying) { // do stuff if (something) keep_trying = false; } Is there anything for this in C++17 or maybe coming in C++2a? 回答1: P0305R1,

问题 I'm hesitant to ask, but there's no documentation that I can find for VBA . Relevant (but I don't think a dupe): C++ When are global variables created? In Java, should variables be declared at the top of a function, or as they're needed? C++ Declare variables at top of function or in separate scopes? and the most likely relevant When are a module's variables in VB.NET instantiated? I also took a look at C# on programmers.SE. I think I'm using the word "Instantiate" right, but please correct